Thomas w



(No Model.)

' T. W. COLLINS.

EEOSESS 0E FASTENING DIAMONDS IN TO0LS. No. 299,055. Patented May 20, 1884.

WITNESSESI I; INVENTOR: dw/ofi" R I BY MW w y M I ATTORNEYS.

N ETERSI Phulo-Lilhognphur. Wash? n nnnnn .C.

lUNlTElD STa'Tns PATENT @rrrcn.

THOMAS \V. (JOl'JLliNS, OF NEWV YORK, N. Y., ASSIGNOR OF ONE-HALF TO ALFRED H. SMITH & 00., OF SAME PLACE.

.. PROCESS OF FASTENING DIAMONDS EN TQOLS.

EBPECIFICATION forming part of Letters Patent No, 299,055, dated Why 20, 1884. Application filed June 19, 1883. (No model.)

To all: whom, it may concern; tion and dried in the air. \Vhen dry, it is Be it known that I, Trroams XV. ()oLLINs, washed in clean water and plaecdin a solution of the city, county, and State of New York, of chloride of gold for a few moments, dried haveinventedcertain new and useful Improveas before, then washed in clean water and 5 ments in the Process of Fastening Diamonds, placed in the electric bath to receive its final 5 5 &c., in Tools, of which the following is a full, coating of metal. The solution of chloride of clear, and exact description. gold may in some cases be dispensed with.

The object of my invention is to provide Second. The diamond is first placed in the certain new and usefulimprovements in fastenbisulphide of carbon and phosphorus and I ing diamonds and, other analogous substances dried. It is then placed in a solution of 60 in the edges and surfaces of abrading and cutnitrate of mercury, washed and dried, after ting tools-such as stonesaws, rock-drills, 8:0. which it is immersed in a strong solution of The invention consistsinsecuring or fastensulphate of copper in contact with metallic ing diamonds in tools by means of metal deiron, when the non-conducting surface will be 1 posited by electricity around the diamond and almost instantly covered with a thin coating 6 5 the adjoining parts of the tool, which deof metallic copper.

posited metal holds the diamond in place se- It is evident that the above processes are curely in the tool. equally applicable for rendering all non-con- Iteference is to be had to the accompanying ducting substances conducting. The diamonds drawings, forming part of this specification, thus coated are placed in the notches a and in which similar letters of reference indicate the sawtooth is then placed in a metal-solucorresponding parts in all the figures. tion bath, and metal is deposited on the tool Figurelisa side view of asaw-tooth notched and the coated diamond by means of an elecfor receiving the diamonds. Fig. 2 is a side tric current. Themetal thus deposited rapidly 25 view of the same showing the covered dia fills in the spaces between the diamond and mend in the notches. Fig. 3 is a side view of the edges of the notches, and thus unites the the same showing the diamonds and the teeth metal covering on the diamonds with thcmetalunited by means of an electric deposit. Fig. covering on the tooth, so that the metal in 4 is a cross-sectional view on the line 00 x, which the diamonds are held and the coating 0 Fig. 3. on thetooth willbccome an integral mass. The S0 The saw-tooth a or other tool in which the diamonds are held very firmly and securely, diamond or analogous substance is to be held and are always held firmly whether the saw is provided with a notch for each diamond, runs in one direction only or forward and the said notches preferably being made dovebackward. Diamonds can be held in all kinds 5 tailed. Those parts of the tool around the of cutting or abrading tools in the manner de- 8 notches are provided with a coating of copper scribed. Other hard precious stonescorunor other metal or alloy by means of an electric dum, or emery, diamondsteel, &c.can be bath. The diamonds B are each provided held in tools in the manner described. If dewith a metal coating, 12, in an electric bath; sired, several small diamonds maybe united 0 but diamonds, being non-conductors,have to be to form one cluster, which is then placed in a specially treated to make them receive a menotch, a, and held in the same in the manner tallic deposit. This is accomplished by either described. of the following processes: I do not abandon or dedicate to the public First. The diamond is first dipped in a soany patentablc feature set forth herein and 45 lution of phosphorus and bisulphide of carnot hereinafter claimed, but reserve the right 5 bon and dried in the atmosphere, when the to claim the same, either in a reissue of any liquid of the solution will be evaporated. It patent that may be granted upon this applicais then placed in a solution of nitrate of silver tion or in other applications for Letters Patent and allowed to remain therein until it becomes that I may make. 7 50 black, when it is removed from the silver solu- Having thus described my invention, what means of metal deposited by electricity,-depositing metal around the notches in the tool by electricity, then placing the coated diamonds in said notches, and then depositing metal in the notches and on the diamond and the tool, and thus uniting the covered diamonds and the tool, substantially as set forth and described.

' THOS. WV COLLINS.

I claim as new, and desire to secure by Letters Patent, is

1. The method of fastening diamonds or analogous substances in tools, consisting in providing the diamonds with a metal coating, placing the coated diamonds in notches in the tool, and then uniting the coated diamonds and the tool by means of electric deposits of metal, substantially as herein shown and described.

2. The method of fastening diamonds or analogous stones in tools, consisting in providing the diamond with a metal covering by Witnesses:

OSCAR F. GUNZ, O. SEDGWIOK. 

